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Work vehicle and method for controlling work vehicle

a technology for working vehicles and work vehicles, applied in the direction of propulsion parts, propulsion using engine-driven generators, gas pressure propulsion mountings, etc., can solve the problems of kinetic energy loss, unfavorable operation of the vehicle, and loss of uniform acceleration or deceleration sense of the vehicle speed, so as to reduce the impact of the moment of inertia of the power transmission device on the behavior of the vehicle, and suppress the feeling of unease in the operator

Active Publication Date: 2019-01-08
KOMATSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]An object of the present invention is to suppress a feeling of unease in the operator by reducing the impact of the moment of inertia in the EMT of a work vehicle on the behavior of the vehicle body.
[0026]According to exemplary embodiment of the present invention, a feeling of unease in the operator is suppressed by reducing the impact of the moment of inertia in the EMT of a work vehicle on the behavior of the vehicle body.

Problems solved by technology

However, in a work vehicle provided with the EMT, the increase of the rotation speed of the rotating elements is not necessarily brought about in response to the increase in the vehicle speed, and the rotation speed of the rotating elements may decrease in accompaniment to an increase in the vehicle speed.
In this case, there is a possibility that a uniform sense of acceleration or sense of deceleration of the vehicle speed may be lost.
Moreover, because the electric motor rotates at a higher speed in comparison to the engine and other rotating elements, the kinetic energy may be great and there may be a large impact on the behavior of the vehicle body due to the moment of inertia.
As a result, this may lead to a feeling of unease in the operator.

Method used

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  • Work vehicle and method for controlling work vehicle
  • Work vehicle and method for controlling work vehicle
  • Work vehicle and method for controlling work vehicle

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Embodiment Construction

[0034]Exemplary embodiments of the present invention will be explained in detail with reference to the figures. FIG. 1 is a side view of a work vehicle 1 according to an exemplary embodiment of the present invention. As illustrated in FIG. 1, the work vehicle 1 is equipped with a vehicle body frame 2, a work implement 3, traveling wheels 4 and 5, and an operating cabin 6. The work vehicle 1 is a wheel loader and travels due to the traveling wheels 4 and 5 being rotated and driven. The work vehicle 1 is able to carry out work, such as excavation, by using the work implement 3.

[0035]The work implement 3 and the traveling wheels 4 and 5 are attached to the vehicle body frame 2. The work implement 3 is driven by hydraulic fluid from a below-mentioned work implement pump 23 (see FIG. 2). The work implement 3 has a boom 11 and a bucket 12. The boom 11 is mounted on the vehicle body frame 2. The work implement 3 includes a lift cylinder 13 and a bucket cylinder 14. The lift cylinder 13 and...

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Abstract

A power transmission device of a work vehicle has an input shaft, an output shaft, a gear mechanism, and an electric motor. The gear mechanism has a planetary gear mechanism and transmits the rotation of the input shaft to the output shaft. The electric motor is connected to a rotating element of the planetary gear mechanism. The power transmission device is configured to change the rotation speed ratio of the output shaft with respect to the input shaft by changing the rotation speed of the electric motor. A control unit has a target torque determination unit and a target torque correcting unit. The target torque determination unit determines a target torque of the electric motor. The target torque correcting unit corrects the target torque according to a correction torque based on a moment of inertia of the electric motor.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a US. National stage application of International Application No. PCT / JP2014 / 082707, filed on Dec. 10, 2014. This US. National stage application claims priority under 35 U.S.C. § 119(a) to Japanese Patent Application No. 2014-009194, filed in Japan on Jan. 22, 2014, the entire contents of which are hereby incorporated herein by reference.BACKGROUND[0002]Field of the Invention[0003]The present invention relates to a work vehicle and a method for controlling the work vehicle.[0004]Background Information[0005]A work vehicle provided with a power transmission device (referred to hereinbelow as a “torque converter-type transmission”) having a torque converter and a multi-stage speed change gear is well known as a work vehicle, such as a wheel loader. However, recently electric-mechanical transmissions (EMT) have become known as power transmission devices in place of torque converter-type transmissions. As disclosed in Japan...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B60W10/08E02F9/20B60K6/445B60W10/10B60W20/00B60L15/20B60K6/365B60K6/387B60K6/547H02P5/747B60K6/54E02F3/28F16H3/72E02F3/34B60K6/38B60K6/44B60L50/16
CPCE02F9/207B60K6/387B60K6/445B60K6/54B60K6/547B60L11/005B60L11/123B60L11/14B60L15/2054B60W10/08B60W10/10B60W20/00E02F3/283E02F9/202E02F9/2004E02F9/2075E02F9/2079F16H3/728H02P5/747B60K6/365Y10S903/903B60K6/44B60K2006/381B60L2200/40B60L2240/12B60L2240/421B60L2240/423B60L2240/441B60L2240/486B60L2250/24B60L2250/26B60W2300/17B60W2710/083B60Y2200/415E02F3/3411Y02P90/60Y02T10/6217Y02T10/6239Y02T10/645Y02T10/7022Y02T10/7077Y02T10/72Y02T10/7275B60W2510/088B60L50/40B60L50/61B60L50/16Y02T10/62Y02T10/64Y02T10/70Y02T10/7072
Inventor MIYAMOTO, SHUNSUKEYAMADA, KENICHIYASUDA, KAORU
Owner KOMATSU LTD
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